#include <stdio.h>
#include <string.h>
int main() {
  char s[101];
  scanf("%s", s);
  int flag[26] = {0}, len = strlen(s), count = 0;
  for (int i = 0; i < len; i++) flag[s[i] - 'a'] = 1;
  for (int i = 0; i < 26; i++) count += flag[i];
  printf("%s\n", count % 2 == 0 ? "CHAT WITH HER!" : "IGNORE HIM!");
}